Throughout the song, Timberlake sings about the struggles of trying to be perfect and constantly comparing himself to others. He acknowledges that he has made mistakes and that he is not always the person he wants to be, but he also expresses a desire to accept and love himself for who he is.
The chorus of the song emphasizes the importance of self-acceptance, with Timberlake singing, "Look at me, I'm in the mirror, looking at the man I've become / He wasn't always what he seemed / But he's still here and he's still me / And I'm proud of who I am."
The song also touches on the idea of facing one's own mortality and the passage of time. Timberlake sings about how he has changed over the years and how he has learned from his experiences. He acknowledges that he is not perfect, but he is still grateful for the journey that he has been on.
Overall, "Mirrors" is a powerful and introspective song that encourages listeners to embrace their flaws and imperfections, and to find beauty and strength in their own unique journeys.